# The 30 largest foundations in South Holland

Tamtam tracks 30 foundations headquartered in South Holland. This list ranks all of them by number of employees on LinkedIn, led by SMK, Lucas Onderwijs and TBI. Their median headcount is 337. Half of them were founded in 1992 or later. The most common headquarters are The Hague (12), Rotterdam (7) and Delft (2).

These foundations in South Holland are primarily active in education, non-profit work, and social services. Many are based in The Hague, with others in Rotterdam, Leiden, and Delft. They range from large organizations like SMK, which develops certification criteria for sustainable business practices, to mid-sized foundations such as Lucas Onderwijs, focused on primary and secondary education, and the IKEA Foundation, which combats poverty and climate change through grants. ICTU supports government services with IT solutions, while TBI is involved in engineering and construction.

A notable pattern is the strong presence of educational foundations, including De Haagse Scholen and Stanislascollege, which manage numerous schools and offer diverse learning concepts. Another significant cluster is in non-profit and social support, with organizations like Leger des Heils Rijnmond Zuidwest providing mental health care and KNCV TB Plus working to eliminate tuberculosis globally. The concentration of these organizations in The Hague suggests a hub for public service and international cooperation.

🇳🇱 South Holland · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [SMK](https://www.tamtam.ai/c/smk) (smk.nl)<br>The company develops and manages certification criteria for sustainable business practices, involving various stakeholders to ensure reliability and transparency in environmental certifications | Renewables & Environment | 🇳🇱 The Hague / Den Haag | 5,654 | 1992 |
| 2 | [Lucas Onderwijs](https://www.tamtam.ai/c/lucas-onderwijs) (lucasonderwijs.nl)<br>Lucas Onderwijs is a foundation for primary and secondary education, operating schools in various municipalities with a focus on quality, diversity, and community partnerships | Primary and Secondary Education | 🇳🇱 The Hague | 774 |  |
| 3 | [TBI](https://www.tamtam.ai/c/tbi) (tbi.nl)<br>A leading player in engineering, construction, and infrastructure, with a focus on delivering innovative and sustainable solutions, investing in social initiatives for a better future | Construction | 🇳🇱 Rotterdam | 719 | 1982 |
| 4 | [De Haagse Scholen](https://www.tamtam.ai/c/de-haagse-scholen) (dehaagsescholen.nl)<br>A foundation in The Hague managing 51 diverse public schools, offering various educational concepts to meet individual learning needs and preparing students for the future | Primary and Secondary Education | 🇳🇱 The Hague | 682 |  |
| 5 | [IKEA Foundation](https://www.tamtam.ai/c/ikea-foundation) (ikeafoundation.org)<br>Strategic philanthropy focused on combating poverty and climate change through grants to improve family livelihoods and protect the planet | Non-profit Organizations | 🇳🇱 Leiden | 551 | 1982 |
| 6 | [ICTU](https://www.tamtam.ai/c/ictu) (ictu.nl)<br>ICTU helps governments improve their services through innovative, high-quality ICT solutions, supporting collaboration between government levels and achieving concrete results for citizens and businesses | IT Services and IT Consulting | 🇳🇱 The Hague | 544 | 2001 |
| 7 | [SCOH Onderwijs en Opvang](https://www.tamtam.ai/c/scoh-onderwijs-en-opvang) (scoh.nl)<br>A educational foundation in The Hague area with 32 primary schools, 5 specialized schools, and 21 preschools, focusing on children's development from toddler to adolescent | Primary and Secondary Education | 🇳🇱 The Hague | 430 |  |
| 8 | [Leger des Heils Rijnmond Zuidwest](https://www.tamtam.ai/c/leger-des-heils-rijnmond-zuidwest) (legerdesheils.nl)<br>The organization provides professional and personal fulfilling work in nursing, social services, and advocacy with a focus on individual care and development opportunities | Mental Health Care | 🇳🇱 Rotterdam | 407 | 1865 |
| 9 | [Stanislascollege](https://www.tamtam.ai/c/stanislascollege) (stanislascollege.nl)<br>A diverse school community offering education from practical to gymnasium levels, rooted in Catholic tradition or interconfessional identity, emphasizing Ignatian Pedagogy | Primary and Secondary Education | 🇳🇱 Delft | 406 | 1948 |
| 10 | [Stichting Anton Constandse](https://www.tamtam.ai/c/stichting-anton-constandse) (antonconstandse.nl)<br>The organization supports people with serious mental health conditions to live as normally as possible through protective housing and home support, offering unique recovery assistance | Mental Health Care | 🇳🇱 The Hague | 372 | 1988 |
| 11 | [KNCV TB Plus](https://www.tamtam.ai/c/kncv-tb-plus) (tuberculose.nl)<br>A Dutch NGO working to eliminate tuberculosis through evidence generation, technical assistance, policy development, and advocacy at national and global levels | Non-profit Organizations | 🇳🇱 The Hague | 369 | 1903 |
| 12 | [Nuffic](https://www.tamtam.ai/c/nuffic) (nuffic.nl)<br>Organization promoting internationalization in education by providing expertise, services, and knowledge worldwide to ensure all students have global opportunities for success | Education Administration Programs | 🇳🇱 The Hague | 353 | 1952 |
| 13 | [SARO - Samen Ambitieus Rotterdams Onderwijs](https://www.tamtam.ai/c/saro-samen-ambitieus-rotterdams-onderwijs) (wijzijnsaro.nl)<br>SARO provides diverse education levels and concepts for children and youth in Rotterdam, fostering growth, learning, and equal opportunities | Primary and Secondary Education | 🇳🇱 Rotterdam | 346 | 2024 |
| 14 | [Hartstichting](https://www.tamtam.ai/c/hartstichting) (hartstichting.nl)<br>Aiming to improve heart health in the Netherlands, this organization raises awareness and funds to prevent heart and vascular diseases Visit hartstichtingnl for more information | Non-profit Organizations | 🇳🇱 The Hague | 338 | 1964 |
| 15 | [European Climate Foundation](https://www.tamtam.ai/c/european-climate-foundation) (europeanclimate.org)<br>Support over 700 partners advancing Paris Agreement goals, promoting practical climate policies, and broadening political and public climate action support. | Philanthropic Fundraising Services | 🇳🇱 The Hague | 337 | 2008 |
| 16 | [Laurentius Stichting](https://www.tamtam.ai/c/laurentius-stichting) (laurentiusstichting.nl)<br>The company operates 27 primary schools, 1 secondary special education school, 1 International school, and various daycare centers in the Netherlands | Primary and Secondary Education | 🇳🇱 Delft | 312 | 1997 |
| 17 | [Mooi Sociaal](https://www.tamtam.ai/c/mooi-sociaal) (mooisociaal.nl)<br>An independent foundation coordinating youth teams in South Holland, promoting empowerment and providing support within families' own environment | Non-profit Organizations | 🇳🇱 Dordrecht | 307 | 2014 |
| 18 | [Young Lady Business Academy](https://www.tamtam.ai/c/young-lady-business-academy) (ylba.nl)<br>Empowering young ambitious women in the Netherlands to increase self-confidence, awareness, and pursue leadership roles in public and private sectors | Professional Training and Coaching | 🇳🇱 Rotterdam | 261 | 2017 |
| 19 | [Woord en Daad](https://www.tamtam.ai/c/woord-en-daad) (woordendaad.nl)<br>A Dutch Christian foundation fighting poverty worldwide, connecting with partners to create sustainable transformation and bring about a world without suffering | Non-profit Organizations | 🇳🇱 Gorinchem | 183 | 1973 |
| 20 | [STO](https://www.tamtam.ai/c/sto) (talent4kidz.nl)<br>The foundation focuses on developing youth talent in various areas, emphasizing quality, fun, reliability, and individual attention to help children grow and learn | Civic and Social Organizations | 🇳🇱 The Hague | 104 |  |
| 21 | [Museum Voorlinden](https://www.tamtam.ai/c/museum-voorlinden) (voorlinden.nl)<br>A private collection of modern and contemporary art is housed at a museum, showcasing diverse works from Dutch and international artists | Museums, Historical Sites, and Zoos | 🇳🇱 Wassenaar | 85 | 2011 |
| 22 | [LAM museum](https://www.tamtam.ai/c/lam-museum) (lammuseum.nl)<br>A unique museum with an international art collection focused on food & consumption, offering a different perspective on everyday objects with Kijkcoaches | Museums, Historical Sites, and Zoos | 🇳🇱 Lisse | 30 | 2008 |
| 23 | [SWK \| Garantie- en waarborgregelingen in de bouw](https://www.tamtam.ai/c/swk-garantie-en-waarborgregelingen-in-de-bouw) (swk.nl)<br>SWK provides warranty certificates for homebuyers, protecting them from risks associated with purchasing new homes, ensuring quality and security | Insurance | 🇳🇱 Rotterdam | 29 | 1978 |
| 24 | [Japanmuseum SieboldHuis](https://www.tamtam.ai/c/japanmuseum-sieboldhuis) (sieboldhuis.org)<br>This company runs a museum in the Netherlands showcasing a unique collection of Japanese objects and artefacts, supported by various institutions | Museums, Historical Sites, and Zoos | 🇳🇱 Leiden | 21 | 2005 |
| 25 | [Lonneke van Leth Dans](https://www.tamtam.ai/c/lonneke-van-leth-dans) (lonnekevanleth.nl)<br>Lonneke van Leth Dans produces dance performances for theaters and locations, making dance appealing to a wide audience since 2002 | Entertainment Providers | 🇳🇱 The Hague | 13 |  |
| 26 | [WoWijs](https://www.tamtam.ai/c/wowijs) (wowijs.nl)<br>WoWijs offers a successful multidisciplinary lifestyle intervention program for children, focusing on healthy eating and exercise through a digital e-learning app | Professional Training and Coaching | 🇳🇱 The Hague | 6 | 2013 |
| 27 | [Stichting Nedlloyd Pensioenfonds (geliquideerd)](https://www.tamtam.ai/c/stichting-nedlloyd-pensioenfonds-geliquideerd) (nedlloyd.com)<br>This company manages the pension obligations of various shipping companies that merged into Nedlloyd, changing names several times over the years | Financial Services | 🇳🇱 Rotterdam | 5 | 1971 |
| 28 | [Stichting Rotterdam Events](https://www.tamtam.ai/c/stichting-rotterdam-events) (koninginnedag.com)<br>SRE is a non-profit organization in Rotterdam organizing events such as Koninginnedag and the successful Sint Nicolaas intocht, with a rotating board of 5 students | Entertainment Providers | 🇳🇱 Rotterdam | 4 | 1992 |
| 29 | [Groundstation.Space](https://www.tamtam.ai/c/groundstation-space) (groundstation.space)<br>A not-for-profit foundation driving Space Data Technology innovation through education, exploration, and collaboration to push the boundaries of possibilities | Defense and Space Manufacturing | 🇳🇱 Noordwijk | 3 | 2017 |
| 30 | [Stibat](https://www.tamtam.ai/c/stibat) (stichting-open.org)<br>A non-profit organization facilitating battery lifecycle management, aiming for maximum recycling and safe processing to support a circular economy | Environmental Services | 🇳🇱 Zoetermeer | 3 | 1995 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

## More company lists in South Holland

- [The largest companies in South Holland](https://www.tamtam.ai/l/largest-companies-south-holland) (2,508)
- [Multinational companies in South Holland](https://www.tamtam.ai/l/multinational-companies-south-holland) (559)
- [Transportation, Logistics, Supply Chain and Storage companies in South Holland](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-south-holland) (276)
- [Logistics companies in South Holland](https://www.tamtam.ai/l/logistics-companies-south-holland) (263)
- [Retail chains in South Holland](https://www.tamtam.ai/l/retail-chains-south-holland) (188)
- [Critical infrastructure operators in South Holland](https://www.tamtam.ai/l/critical-infrastructure-operators-south-holland) (152)
- [Truck Transportation companies in South Holland](https://www.tamtam.ai/l/truck-transportation-companies-south-holland) (145)
- [Professional services firms in South Holland](https://www.tamtam.ai/l/professional-services-firms-south-holland) (145)
- [Software Development companies in South Holland](https://www.tamtam.ai/l/software-development-companies-south-holland) (142)
- [Companies with in-house R&D in South Holland](https://www.tamtam.ai/l/r-and-d-companies-south-holland) (140)
- [SaaS companies in South Holland](https://www.tamtam.ai/l/saas-companies-south-holland) (137)
- [Manufacturers in South Holland](https://www.tamtam.ai/l/manufacturers-south-holland) (134)
- [Family-owned companies in South Holland](https://www.tamtam.ai/l/family-owned-companies-south-holland) (128)
- [Healthcare providers in South Holland](https://www.tamtam.ai/l/healthcare-providers-south-holland) (124)
- [IT Services and IT Consulting companies in South Holland](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-south-holland) (121)
- [Financial services firms in South Holland](https://www.tamtam.ai/l/financial-services-firms-south-holland) (120)
- [Education providers in South Holland](https://www.tamtam.ai/l/education-companies-south-holland) (111)
- [Hospitals and Health Care companies in South Holland](https://www.tamtam.ai/l/hospitals-and-health-care-companies-south-holland) (109)
- [Financial Services companies in South Holland](https://www.tamtam.ai/l/financial-services-companies-south-holland) (107)
- [Consulting firms in South Holland](https://www.tamtam.ai/l/consulting-firms-south-holland) (106)
- [Distributors and wholesalers in South Holland](https://www.tamtam.ai/l/distributors-and-wholesalers-south-holland) (96)
- [IT services companies in South Holland](https://www.tamtam.ai/l/it-services-companies-south-holland) (93)
- [Hardware manufacturers in South Holland](https://www.tamtam.ai/l/hardware-companies-south-holland) (86)
- [Hotel and hospitality groups in South Holland](https://www.tamtam.ai/l/hospitality-groups-south-holland) (86)

## The same list elsewhere in Netherlands

- [Foundations in the Netherlands](https://www.tamtam.ai/l/foundations-netherlands) (122)
- [Foundations in North Holland](https://www.tamtam.ai/l/foundations-north-holland) (40)

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Source: https://www.tamtam.ai/l/foundations-south-holland